HERE'S A POSTCARD that turned up in the Public Relations folders earlier this week. It's taken at dusk from a hilltop north of Chalon and looks south across Culver City, Santa Monica and the bay to the distant lights of Palos Verdes.The College is all alone on its hill -- no Getty Center, no homes clinging to the slopes on the west side of Boehme Canyon. The Humanities Building is there but not Drudis-Biada, which dates this sometime between 1965 and 1973.